PreparationFor dipping sauce: Whisk yogurt, chopped pickle, lemon zest, and oregano in a small bowl to blend. Season sauce to taste with salt and pepper. For fries: Place eggplant in a large bowl. Add 2 cups ice and enough water to cover. Place a plate on top of eggplant to weigh it down. Cover and chill for at least 2 hours and up to 12 hours. Pour oil into a large deep pot to a depth of 2". Attach a deep-fry thermometer to the side of pot and heat oil over medium heat to 325°F. Meanwhile, whisk rice flour, lemon zest, za'atar, garlic powder, and 1 teaspoon sea salt in a medium bowl to blend. Drain eggplant. Working in batches, toss damp eggplant in flour mixture to coat. Working in batches, fry eggplant, turning occasionally, until golden brown, 3-4 minutes per batch. (Reheat oil to 325°F between batches.) Transfer to paper towels to drain. Season with lemon juice and sea salt. Serve immediately with dipping sauce.